how to use for loop using json array in c#

for (int i = 0; i < child[0].roomlist.Count; i++)
            {
                var postdata = new
                {
                    fromDate = fromdate,
                    toDate = todate,
                    hotelRequest = new
                    {
                        roomList = new[]
                               {
                                           new { roomSeq = "54545", roomName = "A.c Room", tariffRequests = new[] { new { tarifSeq = "dfdf45b54", plan = "yu" } } },
                                           new { roomSeq = "5454", roomName = "Del Room", tariffRequests = new[] { new { tarifSeq = "gdgfdg;l;gfd",  plan = "Eu" } } },
                                           new { roomSeq = "5422", roomName = "Suite Room", tariffRequests = new[] { new { tarifSeq = "fdght411", plan = "Euuu" } } },
                                           new { roomSeq = "457", roomName = "Execu  Room", tariffRequests = new[] { new { tarifSeq = "gfgfgf",  plan = "tyt" } } },
                                           new { roomSeq = "222", roomName = "NonRoom", tariffRequests = new[] { new { tarifSeq = "gfgfg",  plan = "tyty" } } } }
                    },
                    datavisible = false
                };

string requestJson = Newtonsoft.Json.JsonConvert.SerializeObject(postdata);